Smith, L. B. & G. J. King 2000. The distribution of Bo-CAL-a alleles in Brassica oleracea is consistent with a genetic model for curd development and domestication of the cauliflower Molec. Breed. 6:603-613.

Snogerup, S. 1980. Chapter 7. The wild forms of the Brassica oleracea group (2n=18) and their possible relations to the cultivated ones (Brassica Crop Wild) 121-132.